// enums/RoShamBo5.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Multiple dispatching using an EnumMap of EnumMaps
// {java enums.RoShamBo5}
package enums;

import java.util.EnumMap;

import static enums.Outcome.*;

enum RoShamBo5 implements Competitor<RoShamBo5> {
    PAPER, SCISSORS, ROCK;
    static EnumMap<RoShamBo5, EnumMap<RoShamBo5, Outcome>>
            table = new EnumMap<>(RoShamBo5.class);

    static {
        for (RoShamBo5 it : RoShamBo5.values())
            table.put(it, new EnumMap<>(RoShamBo5.class));
        initRow(PAPER, DRAW, LOSE, WIN);
        initRow(SCISSORS, WIN, DRAW, LOSE);
        initRow(ROCK, LOSE, WIN, DRAW);
    }

    static void initRow(RoShamBo5 it,
                        Outcome vPAPER, Outcome vSCISSORS, Outcome vROCK) {
        EnumMap<RoShamBo5, Outcome> row =
                RoShamBo5.table.get(it);
        row.put(RoShamBo5.PAPER, vPAPER);
        row.put(RoShamBo5.SCISSORS, vSCISSORS);
        row.put(RoShamBo5.ROCK, vROCK);
    }

    @Override
    public Outcome compete(RoShamBo5 it) {
        return table.get(this).get(it);
    }

    public static void main(String[] args) {
        RoShamBo.play(RoShamBo5.class, 20);
    }
}
/* Output:
ROCK vs. ROCK: DRAW
SCISSORS vs. ROCK: LOSE
SCISSORS vs. ROCK: LOSE
SCISSORS vs. ROCK: LOSE
PAPER vs. SCISSORS: LOSE
PAPER vs. PAPER: DRAW
PAPER vs. SCISSORS: LOSE
ROCK vs. SCISSORS: WIN
SCISSORS vs. SCISSORS: DRAW
ROCK vs. SCISSORS: WIN
SCISSORS vs. PAPER: WIN
SCISSORS vs. PAPER: WIN
ROCK vs. PAPER: LOSE
ROCK vs. SCISSORS: WIN
SCISSORS vs. ROCK: LOSE
PAPER vs. SCISSORS: LOSE
SCISSORS vs. PAPER: WIN
SCISSORS vs. PAPER: WIN
SCISSORS vs. PAPER: WIN
SCISSORS vs. PAPER: WIN
*/
